AN INVESTIGATION OF PULSE DURATION MODULATION.
Abstract
This investigation shows that a pulse duration modulation system can be made to work with low distortion. A simple four-section RC filter with a tuned circuit for carrier rejection was used to recover the signal. At the beginning of the investigation an attempt was made to measure the magnitude of each sideband using a harmonic wave analyzer. This method did not work because different sidebands fall at the same frequency (or within a few cycles) and gave readings very difficult to decipher. A small drift in either frequency (especially the signal multiples of it appear in the sidebands) caused all sidebands to drift. Since lower and upper sidebands drifted in opposite directions with a frequency change two successive readings could disagree drastically.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1965
- Accession Number
- AD0617085
Entities
People
- Billy F. Lucas
Organizations
- Kansas State University